18
MOTORMASTER®
V
CONTROL
INSTALLATION
(48TM025 Only)
Install Field-Fabricated Wind Baffles — Wind baffles must
be field-fabricated for all units to ensure proper cooling cycle
operation at low ambient temperatures. See Fig. 22 for baffle
details. Use 20-gage, galvanized sheet metal, or similar
corrosion-resistant metal for baffles. Use field-supplied screws
to attach baffles to unit. Screws should be
1
/
4
-in. diameter and
5
/
8
-in. long. Drill required screw holes for mounting baffles.
Install Motormaster V Controls — The Motormaster V
(MMV) control is a motor speed control device which adjusts
condenser fan motor speed in response to declining liquid
refrigerant pressure. A properly applied Motormaster V control
extends the operating range of air-conditioning systems and
permits operation at lower outdoor ambient temperatures.
The minimum ambient temperatures at which the unit will
operate are:
To operate down to the ambient temperatures listed,
Motormaster V controls (Fig. 24) must be added. Field-
fabricated and installed wind baffles are also required for all units
(see Fig. 22). The Motormaster V control permits operation of
the unit to an ambient temperature of –20 F (–29 C). The control
regulates the speed of 3-phase fan motors that are compatible
with the control. These motors are factory installed.
See Table 6 for the Motormaster V control accessory
package usage. Table 7 shows applicable voltages and motors.
Replacement of fan motor
IS NOT REQUIRED ON
CURRENT PRODUCTION UNITS
since the control is
compatible with the factory-installed fan motors. Only field
wiring control is required.
Install the Motormaster V control per instructions supplied
with accessory.
Table 6 — Motormaster V Control Package Usage
Table 7 — Applicable Voltages and Motors
To avoid damage to the refrigerant coils and electrical com-
ponents, use recommended screw sizes only. Use care
when drilling holes.
TEMPERATURE OPERATING LIMITS — F° (C°)
Standard
Unit
Unit with
Low Ambient Kit
Unit with
MMV Control
40 (4)
25 (–4)
–20 (–29)
UNIT
VOLTAGE
ITEM DESCRIPTION
48TM016-028
208/230
CRLOWAMB015A00
460
CRLOWAMB016A00
575
CRLOWAMB017A00
VOLTAGE
COMPATIBLE MOTOR
208/230-3-60
HD52AK654
460-3-60
HD52AK654
575-3-60
HD52GE576
Fig. 24 — Motormaster® V Control
2 5 6
2
12 13A
13B
13C
1
2
3
TO MOTOR(S)
TO PRESSURE
TRANSDUCER
BLK
YEL
BLU
FROM FUSE BLOCK
B
Содержание 48TM016
Страница 3: ...3 Fig 2A Roof Curb Details 48TM016 025 ...
Страница 4: ...4 Fig 2B Roof Curb Details 48TM028 ...
Страница 6: ...6 Fig 4 Base Unit Dimensions 48TM016 020 ...
Страница 7: ...7 Fig 5 Base Unit Dimensions 48TM025 ...
Страница 8: ...8 Fig 6 Base Unit Dimensions 48TM028 ...
Страница 32: ...32 Fig 46 MoistureMi er Dehumidification Operation Diagram TXV Thermostatic Expansion Valve ...
Страница 48: ...48 Fig 57 Typical Wiring Schematic 48TM016 020 208 230 V Shown ...
Страница 49: ...49 Fig 58 Typical Component Arrangement ...
Страница 56: ...56 Fig 60 EconoMi erIV Functional View ...
Страница 59: ......